Apparatus and method of resource allocation for data and control channels in a wireless communication system

ABSTRACT

A method and system for resource allocation is provided. A method includes identifying a set of resource blocks associated with a control channel for a terminal; transmitting, to the terminal, information on the set of resource blocks on a radio resource control signal, the information including first information indicating resource blocks included in the set of resource blocks and second information indicating a number of symbols corresponding to the set of resource blocks; transmitting, to the terminal, control information including information for downlink data on the control channel identified based on the first information and the second information; and transmitting, to the terminal, the downlink data on a data channel based on the control information. The set of resource blocks includes at least one control channel resource. A search space for the control channel of the terminal is defined based on an aggregation level, a number of the at least one control channel resource, and a number of a candidate associated with the control channel.

PRIORITY

The present application is a Continuation of U.S. application Ser. No.16/286,001, which was filed in the U.S. Patent and Trademark Office(USPTO) on Feb. 26, 2019, which is a Continuation of U.S. applicationSer. No. 13/459,907, which was filed in the USPTO on Apr. 30, 2012,issued as U.S. Pat. No. 10,219,282 on Feb. 26, 2019, and claims priorityunder 35 U.S.C. § 119(e) to U.S. Provisional Application No. 61/480,809,which was filed in the USPTO on Apr. 29, 2011, the entire disclosure ofeach of which is incorporated herein by reference.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present invention relates generally to a wireless cellularcommunication system, and more particularly, to an Orthogonal FrequencyDivision Multiple Access (OFDMA) wireless communication system, whereincontrol and data channels for a particular User Equipment (UE) aretime-division multiplexed.

2. Description of the Related Art

In 3rd Generation Partnership Project Long Term Evolution (3GPP LTE)Release 8, i.e., a legacy system, a Physical Downlink Control CHannel(PDCCH) is presented in several initial Orthogonal Frequency DivisionMultiplexing (OFDM) symbols. The number of OFDM symbols used for thePDCCH is indicated in a Physical Control Format Indication CHannel(PCFICH) in a first OFDM symbol. Each PDCCH includes L Control ChannelElements (CCEs), where L=1, 2, 4, or 8, representing different CCEaggregation levels. Each CCE includes 9 Resource Element Group (REG)spreading on the transmission bandwidth.

Upon receiving the PDCCH, the UE blindly attempts decoding the PDCCH onits search space. The search space contains multiple possible CCEstarting indexes and CCE aggregation levels. The UE attempts to decodean expected Downlink Control Information (DCI) format based in thisassumption. If a Cyclic Redundancy Check (CRC) passes, the UE assumes aDCI format is successfully received. In legacy 3GPP systems, e.g., 3GPPLTE Releases 8-10, the PDCCH is transmitted using transmit diversitywhen multiple antennas are available, and the UE uses common referencesignals inside the PDCCH region for decoding. The common referencesignals are cell-specific.

SUMMARY OF THE INVENTION

An aspect of the present invention is to provide an apparatus andmethods for a wireless system to schedule both control and data channelwithin the same bandwidth, wherein resource blocks in the frequencydomain are assigned to a UE, and the assigned resource blocks areselected such that the UE will have better channel gain on thoseselected resource blocks.

Another aspect of the present invention is to impose a constraint onresource scheduling for both control and data channels, such that aresource allocated to a data channel must be overlapped by at leastresource block used by a control channel.

By introducing such resource allocation constraints to the system, thenumber of information bits needed to be carried by the DCI can bereduced, reducing system overhead and improving system performance.

In accordance with an aspect of the present invention, a downlinktransmission method by a base station in a wireless communication systemis provided. The downlink transmission method includes identifying a setof resource blocks associated with a control channel for a terminal;transmitting, to the terminal, information on the set of resource blockson a radio resource control signal, the information including firstinformation indicating resource blocks included in the set of resourceblocks and second information indicating a number of symbolscorresponding to the set of resource blocks; transmitting, to theterminal, control information including information for downlink data onthe control channel identified based on the first information and thesecond information; and transmitting, to the terminal, the downlink dataon a data channel based on the control information. The set of resourceblocks includes at least one control channel resource. A search spacefor the control channel of the terminal is defined based on anaggregation level, a number of the at least one control channelresource, and a number of a candidate associated with the controlchannel.

In with accordance another aspect of the present invention, a downlinkreception method by a terminal in a mobile communication system isprovided. The downlink reception method includes receiving, from a basestation, information on a set of resource blocks associated with acontrol channel for the terminal, the information including firstinformation indicating resource blocks included in the set of resourceblocks and second information indicating a number of symbolscorresponding to the set of resource blocks; receiving, from the basestation, control information including information for downlink data onthe control channel identified based on the first information and thesecond information; and receiving, from the base station, the downlinkdata on a data channel based on the control information. The set ofresource blocks includes at least one control channel resource. A searchspace for the control channel of the terminal is defined based on anaggregation level, a number of the at least one control channelresource, and a number of a candidate associated with the controlchannel.

In accordance with another aspect of the present invention, a basestation apparatus in a mobile communication system is provided. The basestation apparatus includes a transceiver; and a controller coupled withthe transceiver and configured to identify a set of resource blocksassociated with a control channel for a terminal, transmit, to theterminal, information on the set of resource blocks on a radio resourcecontrol signal, the information including first information indicatingresource blocks included in the set of resource blocks and secondinformation indicating a number of symbols corresponding to the set ofresource blocks, transmit, to the terminal, control informationincluding information for downlink data on the control channelidentified based on the first information and the second information,and transmit, to the terminal, the downlink data on a data channel basedon the control information. The set of resource blocks includes at leastone control channel resource. A search space for the control channel ofthe terminal is defined based on an aggregation level, a number of theat least one control channel resource, and a number of a candidateassociated with the control channel.

In accordance with another aspect of the present invention, a terminalin a mobile communication system is provided. The terminal includes atransceiver; and a controller coupled with the transceiver andconfigured to receive, from a base station, information on a set ofresource blocks associated with a control channel for the terminal, theinformation including first information indicating resource blocksincluded in the set of resource blocks and second information indicatinga number of symbols corresponding to the set of resource blocks,receive, from the base station, control information includinginformation for downlink data on the control channel identified based onthe first information and the second information, and receive, from thebase station, the downlink data on a data channel based on the controlinformation. The set of resource blocks includes at least one controlchannel resource. A search space for the control channel of the terminalis defined based on an aggregation level, a number of the at least onecontrol channel resource, and a number of a candidate associated withthe control channel.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features, and advantages of certainembodiments of the present invention will be more apparent from thefollowing description taken in conjunction with the accompanyingdrawings, in which:

FIG. 1 illustrates two examples of a subframe including extended PDCCHregions according to an embodiment of the present invention;

FIG. 2 illustrates resource allocation restriction for a PDCCH and aPhysical Downlink Shared CHannel (PDSCH) according to an embodiment ofthe present invention;

FIG. 3A is a flowchart illustrating an evolved Node B (eNB) method ofresource allocation restriction according to an embodiment of thepresent invention;

FIG. 3B Is a flowchart illustrating a UE method of resource allocationrestriction according to an embodiment of the present invention;

FIG. 4 illustrates resource allocation mandating a PDCCH RB to include aPDSCH resource according to an embodiment of the present invention;

FIG. 5A is a flow chart illustrating an eNB resource allocationmandating method according to an embodiment of the present invention;

FIG. 5B is a flow chart illustrating a UE resource allocation mandatingmethod according to an embodiment of the present invention;

FIG. 6 is a block diagram illustrating a base station according to anembodiment of the present invention; and

FIG. 7 is a block diagram illustrating a UE according to an embodimentof the present invention.

DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION

Various embodiments of the present invention will now be described indetail with reference to the accompanying drawings. In the followingdescription, specific details such as detailed configuration andcomponents are merely provided to assist the overall understanding ofthese embodiments of the present invention. Therefore, it should beapparent to those skilled in the art that various changes andmodifications of the embodiments described herein can be made withoutdeparting from the scope and spirit of the present invention. Inaddition, descriptions of well-known functions and constructions areomitted for clarity and conciseness.

In an evolutionary system based on LTE Release 10, such as Release 11and beyond, the PDCCH might be further extended into the legacy datachannel region. For example, a system can either assign one or a fewOFDM symbols, e.g., a next one or two OFDM symbols following the legacyPDCCH symbols in a subframe, or assign a sub-set of Resource Blocks(RBs) for extended PDCCH.

FIG. 1 illustrates two examples of a subframe including extended PDCCHregions.

Referring to FIG. 1, in subframes 101 and 102, each of the symbols tothe right of those indicated as being within the legacy PDCCH region,except those indicated as common reference signals, can be considered asbeing part of the legacy data channel region. In subframe 101, the PDCCHis extended into the legacy data channel region, by assigning a nextsymbol following the symbols of the legacy PDCCH region as an extendedPDCCH region. Further, in subframe 102, the PDCCH is extended into thelegacy data channel region, by assigning all of the symbols of thelegacy data channel region in RB 103 as an extended PDCCH region.

For the extended PDCCH, because it can be either locally or distributedlocated in the frequency domain, a system can exploit multi-user gain byscheduling preferable subbands with better channel gain to respectiveusers. In general, several key objectives have been proposed for theextended PDCCH. First, the resources available for the PDCCH areextended, in particular for carrier aggregation as well as for otherfeatures that also increase the required resources for the PDCCH, suchas Multiple User Multiple Input/Multiple Output (MU-MIMO). Second,interference mitigation of the PDCCH for heterogeneous networks might beperformed as the extended PDCCH is defined in the PDSCH region, andtherefore RB-based interference management and coordination can beperformed.

Common Resource Restriction for Both Extended Control Channel and DataChannels

In a wireless OFDM system according to an embodiment of the presentinvention, a subset of RBs included in the full bandwidth are selectedfor a particular UE. The subset may be different from UE to UE, and thesize of the subset, i.e., the number of RBs included in the subset, mayvary.

More specifically, a base station (or eNB) determines whether or notresource restriction should be applied to a UE and selects RBs for theUE based on information and feedback of the UE, e.g., channelinformation on a subband, expected traffic for the UE, channel statusfeedback information, etc. When the resource restriction decision ismade, the eNB sends a configuration message to the UE, informing the UEof its assigned control and data channels. For example, theconfiguration message can be transmitted via high layer Radio ResourceControl (RRC) message, hereinafter referred to as an RRC resourcerestriction message. Further, the RB sub-set configuration may besemi-statically configured, i.e., once configured, it is not to beexpected to be re-configured for a certain period of time, e.g., severalradio frames.

After the UE is allocated with the RB sub-set restriction, it assumesall control and data payload will be transmitted using the allocatedRBs. Basically, the UE assumes the allocated subset of RBs as a virtualsystem bandwidth, and the resource partitioning and assignment will bedone based on this assumption.

Because the size of the virtual system bandwidth is reduced as indicatedby the configuration message, the bits used for resource allocation canbe accordingly reduced.

For a system bandwidth with N_(RB) RBs, out of which N_(RB) ^(Subset,u)RBs are allocated to a UE u, the RRC configuration can be an NRB-bitbitmap indicated, if each RB is allocated for the UE. In 3GPP, thenumber of bits used for resource allocation is shown below.

Resource Allocation Type 0&1: ┌N_(RB)/P┐

Resource Allocation Type 2: ┌ log₂ (N_(RB)(N_(RB)+1)/2)┐

With a resource restriction method in accordance with an embodiment ofthe present invention, the number of bits used for resource allocationwithin an RB subset is reduced as shown below.

Resource Allocation Type 0&1: ┌N_(RB) ^(Subset,u)/P┐

Resource Allocation Type 2: ┌ log₂ (N_(RB) ^(Subset,u) (N_(RB)^(Subset,u)+1)/2)┐

Because a new DCI format size with the resource restriction method willbe variable and user-specific, restrictions should be imposed on thevalue of N_(RB) ^(Subset,u), such that it does not conflict with otherDCIs format sizes. The restricted values of N_(RB) ^(Subset,u) willdepend on the system bandwidth.

FIG. 2 illustrates resource allocation restriction for a PDCCH and PDSCHaccording to an embodiment of the present invention. Specifically, FIG.2 illustrates an example of type 2 resource allocation, where a 6-RBsystem is presented.

Referring to FIG. 2, the RRC resource restriction message indicates thatRBs 1-4 are allocated as the RB subset for UE u, and a field forindicating the PDSCH data resource in a DCI format assigns RBs 2-4 forPDSCH transmission. In this example, 1 bit (RB 1) is saved for DCIformat for downlink allocation. The savings will be more significant ifthe system bandwidth increases and the subset size decreases.

FIG. 3A is a flowchart illustrating an evolved Node B (eNB) method ofresource allocation restriction according to an embodiment of thepresent invention.

Referring to FIG. 3A, the eNB performs initial access for a UE in step305. For example, the eNB and UE can set up communication as defined inthe legacy systems.

In step 310, the eNB collects UEs feedback and other information. Forexample, the other information may include at least one of channelinformation on a subband, expected traffic of the UE, and channel statusfeedback information.

Based on the collected information, the eNB performs scheduling for theUE in step 315, and determines whether or not resource restrictionshould be applied to the UE in step 320.

When resource restriction is applied (or modified from a previousrestriction), the eNB send a message, i.e., an RRC resource restrictionmessage, to the UE to activate(or update) the resource restriction instep 325. For example, the RRC resource restriction message can be abitmap indicating which RBs or which predefined subbands are allocatedto the UE. The RRC resource restriction message can also take acompressed version for

RB indication, e.g., the tree structure indication illustrated in FIG.2, where each node indicates all the branches under it.

In step 330, the eNB transmits PDCCH and PDSCH payload to the UE usingthe restricted resources.

When resource restriction is not applied in step 320, legacy operationsare performed without sending any configuration to the UE in step 335.Alternatively, in step 335, the eNB can indicate all of the RBs orsubbands included in the system bandwidth, such that no resourcerestriction is applied.

In step 340, the eNB determines whether communication between the eNBand the UE is finished. When the communication is not finished, themethod returns to step 310, where the eNB collects the UE feedback andother information. When the communication is finished, the method ends.

FIG. 3B is a flowchart illustrating a UE method of resource allocationrestriction according to an embodiment of the present invention.

Referring to FIG. 3B, the UE performs initial access for the eNB in step355. For example, the UE and the eNB can set up communication as definedin the legacy systems.

In step 360, the UE transmits feedback and other information to the eNB.As described above, the other information may include channelinformation on a subband, expected traffic of the UE, channel statusfeedback information, etc.

In step 365, the UE receives a message from the eNB. The message may bean RRC resource restriction message, such as a bitmap indicating whichRBs or which predefined subbands are allocated to the UE.

In step 370, the UE decode the message and determine whether or notresource restriction is applied to the UE.

When the UE receives the RRC resource restriction message, the UEre-indexes its available RBs and re-partitions resources for potentialextended PDCCH usage based on the RRC resource restriction message instep 375.

In step 380, the UE decodes PDCCH and PDSCH payload received within therestricted resources. More specifically, the eNB sends both the controland data channels to the UE, as scheduled by the RRC resourcerestriction message. The UE first tries extended PDCCH blind decoding onthe modified search spaces, which are restricted in the RB subset.Because the PDSCH data channel transmission will also be restrictedwithin the RB subset, the size of related DCI format will also bechanged. The UE also takes this into account when doing the controlchannel blind decoding. After decoding the extended PDCCH, the UElocates its assigned PDSCH resource within the RB subset, and thendecodes the data carried therein.

When the UE does not receive an RRC resource restriction message in step370, legacy reception for PDCCH and PDSCH is performed in step 385.Alternatively, the UR could receive an indication that all of the RBs orsubbands of the system bandwidth are available, so that no resourcerestriction is applied.

In step 390, the UE determines whether communication between the UE andthe eNB is finished. If the communication is not finished, the methodreturns to step 360; otherwise, the method is ended.

Common Resource Mandating for Control and Data Channel

In accordance with another embodiment of the present invention, a systemcan mandate common resources for both control and data channels, suchthat the resources for the two channels can be bonded in frequencydomain, and the resource allocation indication field size can be reducedaccordingly. For example, the resource block of control channel and theresource block of data channel have at least one resource block incommon.

There are multiple alternatives for defining a common resource. Forexample, a common resource can be defined such that a PDSCH must includeat least a first RB in which an extended PDCCH is located.Alternatively, a common resource can be defined such that a PDSCH mustinclude at least a first a few RBs (e.g., in granularity of a RB groupas defined in 3GPP specification) in which an extended PDCCH is located.A common resource can also be defined such that a PDSCH must include allof the RBs occupied by the extended PDCCH.

In a system where an RB is exclusively allocated for an extended PDCCH,the neighboring one or several RBs next to the first extended PDCCH RBcan be mandated to be included in PDSCH resource.

FIG. 4 illustrates resource allocation mandating a PDCCH RB to include aPDSCH resource according to an embodiment of the present invention.Specifically, FIG. 4 illustrates two RBs used for extended PDCCHtransmission.

Referring to FIG. 4, in a system where a PDCCH resource is mandated tobe a subset of PDSCH transmission, only code points inclusive of the twoPDCCH RBs are used for PDSCH resource allocation. These code pointsexclusive of either of the two PDCCH RBs are not considered for PDSCHresource allocation. The possible code point will be significantlyreduced and so be done for the resource allocation field size,accordingly.

In FIG. 4, a size of a resource allocation field size depends on astarting location of a PDCCH. Further, when the UE is attempting blinddecoding, the UE will assume different DCI format size for each searchspace.

FIG. 5A is a flow chart illustrating an eNB resource allocationmandating method according to an embodiment of the present invention.

Referring to FIG. 5, the eNB performs initial access for the UE in step505. For example, the eNB and UE can set up communication as defined inthe legacy systems.

In step 510, the eNB collects UE feedback and other information. Again,the other information may include channel information on a subband,expected traffic of the UE, channel status feedback information, etc.

Based on the collected information, the eNB performs scheduling for theUE in step 515, and determines whether or not resource mandating shouldbe applied to the UE in step 520

When resource mandating is applied (or modified from a previousmandate), the eNB sends a message to the UE to activate (or update) theresource mandating in step 525. For example, the message may be an RRCmessage, which includes a short flag indicating whether a resourcemandating mode is on or off. Additionally, there can be anotherindependent RRC message restricting the resource to be used by thePDCCH.

In step 530, the eNB transmits PDCCH and PDSCH payloads using themandated resources.

When resource mandating is not applied in step 520, legacy operationsare performed, without sending any configuration to the UE in step 535.Alternatively, to the eNB may indicate all RBs or subbands of the systembandwidth, so that no resource mandating is applied.

In step 540, the eNB determines whether or not communication between theeNB and the UE is finished. If the communication is not finished, themethod returns to step 510, where the eNB collects the UE feedback andother information.

FIG. 5B is a flow chart illustrating a UE resource allocation mandatingmethod according to an embodiment of the present invention.

Referring to FIG. 5B, the UE performs initial access for the eNB in step555. For example, the UE and the eNB can set up communication as definedin the legacy systems.

In step 560, the UE transmits feedback of the UE and other information.The other information may include channel information on a subband,expected traffic of the UE, channel status feedback information, etc.

In step 565, the UE receives a message from the eNB. The message mayinclude resource mandating information, i.e., the message may be a RRCmessage for resource mandating.

In step 570, the UE decodes the received message and determines whetheror not resource mandating is applied to the UE.

When resource mandating is applied, the UE assumes that the PDSCHresource allocated to it will be mandated as indicated therein.Accordingly, in step 575, the user re-generates search spaces andrespective DCI sizes, based on the message.

In step 580, the UE decodes the PDCCH and PDSCH payload included in themandated resources. More specifically, the eNB sends both the controland data channels to the UE as scheduled by the RRC signals. Afterdecoding the extended PDCCH, the UE locates its assigned PDSCH resourcewithin an RB subset, and then decodes the data carried therein.

When the UE does not receive resource mandating in step 570, legacyreception is performed for the PDCCH and the PDSCH in step 585.Alternatively, to the eNB may indicate all of the RBs or subbands of thesystem bandwidth, so that no resource mandating is applied.

In step 590, the UE determines whether or not communication between theUE and the eNB is finished. If the communication is not finished, themethod returns to step 560; otherwise, the method ends.

FIG. 6 is a block diagram illustrating a base station according to anembodiment of the present invention.

Referring to FIG. 6, the base station (or eNB) includes a transceiver601 and a controller 602. The transceiver 601 transmits and receivessignals, e.g., with a UE. The controller 602, e.g., a processor,controls the base station to operate according to the methods describedabove and illustrated in FIGS. 3A and 5A.

FIG. 7 is a block diagram illustrating a UE according to an embodimentof the present invention.

Referring to FIG. 7, the UE includes a transceiver 701 and a controller702. The transceiver 701 transmits and receives signals, e.g., with aneNB. The controller 702, e.g., a processor, controls the UE to operateaccording to the methods described above and illustrated in FIGS. 3B and5B.

Although certain embodiments of the present invention have beendescribed in detail hereinabove, it should be clearly understood thatmany variations and modifications of the basic inventive concepts hereintaught, which may appear to those skilled in the present art, will stillfall within the spirit and scope of the present invention, as defined inthe appended claims and their equivalents.

What is claimed is:
 1. A downlink transmission method by a base stationin a wireless communication system, the downlink transmission methodcomprising: identifying a set of resource blocks associated with acontrol channel for a terminal; transmitting, to the terminal,information on the set of resource blocks on a radio resource controlsignal, the information including first information indicating resourceblocks included in the set of resource blocks and second informationindicating a number of symbols corresponding to the set of resourceblocks; transmitting, to the terminal, control information includinginformation for downlink data on the control channel identified based onthe first information and the second information; and transmitting, tothe terminal, the downlink data on a data channel based on the controlinformation, wherein the set of resource blocks includes at least onecontrol channel resource, and wherein a search space for the controlchannel of the terminal is defined based on an aggregation level, anumber of the at least one control channel resource, and a number of acandidate associated with the control channel.
 2. The downlinktransmission method of claim 1, wherein the set of resource blocks forthe terminal is identified based on radio resource control (RRC)signaling.
 3. The downlink transmission method of claim 1, wherein thefirst information includes bit map information associated with a set of6 resource blocks.
 4. The downlink transmission method of claim 1,wherein the second information includes duration information associatedwith a number of Orthogonal Frequency Division Multiplexing (OFDM)symbols.
 5. The downlink transmission method of claim 1, wherein the atleast one control channel resource is mapped by a distributed orlocalized method in the set of resource blocks, through a radio resourcecontrol (RRC).
 6. A downlink reception method by a terminal in a mobilecommunication system, the downlink reception method comprising:receiving, from a base station, information on a set of resource blocksassociated with a control channel for the terminal, the informationincluding first information indicating resource blocks included in theset of resource blocks and second information indicating a number ofsymbols corresponding to the set of resource blocks; receiving, from thebase station, control information including information for downlinkdata on the control channel identified based on the first informationand the second information; and receiving, from the base station, thedownlink data on a data channel based on the control information,wherein the set of resource blocks includes at least one control channelresource, and wherein a search space for the control channel of theterminal is defined based on an aggregation level, a number of the atleast one control channel resource, and a number of a candidateassociated with the control channel.
 7. The downlink reception method ofclaim 6, wherein the set of resource blocks for the terminal isidentified based on radio resource control (RRC) signaling.
 8. Thedownlink reception method of claim 6, wherein the first informationincludes bit map information associated with a set of 6 resource blocks.9. The downlink reception method of claim 6, wherein the secondinformation includes duration information associated with a number ofOrthogonal Frequency Division Multiplexing (OFDM) symbols.
 10. Thedownlink reception method of claim 6, wherein the at least one controlchannel resource is mapped by a distributed or localized method in theset of resource blocks, through a radio resource control (RRC).
 11. Abase station apparatus in a mobile communication system, the basestation apparatus comprising: a transceiver; and a controller coupledwith the transceiver and configured to: identify a set of resourceblocks associated with a control channel for a terminal, transmit, tothe terminal, information on the set of resource blocks on a radioresource control signal, the information including first informationindicating resource blocks included in the set of resource blocks andsecond information indicating a number of symbols corresponding to theset of resource blocks, transmit, to the terminal, control informationincluding information for downlink data on the control channelidentified based on the first information and the second information,and transmit, to the terminal, the downlink data on a data channel basedon the control information, wherein the set of resource blocks includesat least one control channel resource, and wherein a search space forthe control channel of the terminal is defined based on an aggregationlevel, a number of the at least one control channel resource, and anumber of a candidate associated with the control channel.
 12. The basestation apparatus of claim 11, wherein the set of resource blocks forthe terminal is identified based on radio resource control (RRC)signaling.
 13. The base station apparatus of claim 11, wherein the firstinformation includes bit map information associated with a set of 6resource blocks.
 14. The base station apparatus of claim 11, wherein thesecond information includes duration information associated with anumber of Orthogonal Frequency Division Multiplexing (OFDM) symbols. 15.The base station apparatus of claim 11, wherein the at least one controlchannel resource is mapped by a distributed or localized method in theset of resource blocks, through a radio resource control (RRC).
 16. Aterminal in a mobile communication system, the terminal comprising: atransceiver; and a controller coupled with the transceiver andconfigured to: receive, from a base station, information on a set ofresource blocks associated with a control channel for the terminal, theinformation including first information indicating resource blocksincluded in the set of resource blocks and second information indicatinga number of symbols corresponding to the set of resource blocks,receive, from the base station, control information includinginformation for downlink data on the control channel identified based onthe first information and the second information, and receive, from thebase station, the downlink data on a data channel based on the controlinformation, wherein the set of resource blocks includes at least onecontrol channel resource, and wherein a search space for the controlchannel of the terminal is defined based on an aggregation level, anumber of the at least one control channel resource, and a number of acandidate associated with the control channel.
 17. The terminal of claim16, wherein the set of resource blocks for the terminal is identifiedbased on radio resource control (RRC) signaling.
 18. The terminal ofclaim 16, wherein the first information includes bit map informationassociated with a set of 6 resource blocks.
 19. The terminal of claim16, wherein the second information includes duration informationassociated with a number of Orthogonal Frequency Division Multiplexing(OFDM) symbols.
 20. The terminal of claim 16, wherein the at least onecontrol channel resource is mapped by a distributed or localized methodin the set of resource blocks, through a radio resource control (RRC).